SEISMIC RETROFIT OF REINFORCED CONCRETE BUILDINGS DESIGNED FOR GRAVITY LOADS: PERFORMANCE OF STRUCTURAL MODEL

A partially prestressed concrete alternative and two masonry retrofit alternatives are analyzed for improving the local and global response performance of reinforced concrete frame structures designed only for gravity loads and constructed in low-to-moderate seismic zones. The objective of these retrofits is to reconfigure the structural failure mode by averting a catastrophic soft-story collapse and enforcing a more ductile beam sidesway mechanism. A prestressed concrete jacketing alternative to limited columns was selected to retrofit the one-third scale model reinforced concrete frame building that had been previously tested by the authors. The seismic response of the retrofit model structure was investigated experimentally using the "shaking table" at State University of New York at Buffalo. A comparison is made of the experimental frame response before and after retrofitting. It is concluded that the seismic performance of vulnerable (soft-story prone) gravity load design frames may be effectively enhanced by strengthening limited columns and thus, changing the failure mode to a beam sidesway mechanism with acceptable story deformation levels.

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  • Corporate Authors:

    American Concrete Institute

    P.O. Box 19150, Redford Station, 22400 Seven Mile Road
    Detroit, MI  United States  48219
  • Authors:
    • Bracci, J M
    • Reinhorn, A M
    • Mander, J B
  • Publication Date: 1995-11

Language

  • English

Media Info

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Filing Info

  • Accession Number: 00715281
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 28 1996 12:00AM